package com.cgy.wodeyigui.product.service.impl;

import com.cgy.wodeyigui.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.cgy.common.utils.PageUtils;
import com.cgy.common.utils.Query;

import com.cgy.wodeyigui.product.dao.CategoryDao;
import com.cgy.wodeyigui.product.entity.CategoryEntity;
import com.cgy.wodeyigui.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1：查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2:组装
          //1)找出所有一级分类：1级分类父id为0
        List<CategoryEntity> level1Menus = entities.stream().filter((categoryEntity) ->
            categoryEntity.getParentCid() == 0//
        ).map((Menu)->{
            Menu.setChildren(getChilderns(Menu,entities));
            return Menu;
        }).sorted((Menu1,Menu2)->{
            return Menu1.getSort()-Menu2.getSort();
        }).collect(Collectors.toList());
        return level1Menus;

    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1.检查当前删除的菜单是否被别的地方引用TODO
        //逻辑删除，使用某一个字段作为标识位 show_status 1：不删除，0：删除

        baseMapper.deleteBatchIds(asList);

    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);
        return (Long[]) parentPath.toArray(new Long[parentPath.size()]);
    }
    @Transactional
    @Override
    public void updateCascade(CategoryEntity category) {
        //级联更新所有关联的数据
        this.updateById(category);
        //更新关联表
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    private List<Long> findParentPath(Long catelogId, List<Long> paths){
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;
    }

    //获取某一个菜单的子菜单
    //递归查找所有子菜单
    private List<CategoryEntity> getChilderns(CategoryEntity entity, List<CategoryEntity> all ){
        List<CategoryEntity> Childerns = all.stream().filter((categoryEntity) -> {
            return categoryEntity.getParentCid().equals(entity.getCatId());
        }).map(categoryEntity->{
            //找到子菜单
            categoryEntity.setChildren(getChilderns(categoryEntity,all));
            return categoryEntity;
            //排序
        }).sorted((Menu1,Menu2)->{
            return Menu1.getSort()-Menu2.getSort();
        }).collect(Collectors.toList());
        return Childerns;
    }

}